Acid resisting alloy



' Patented Oct. 17, 1933 The chief object of my invention is an alloy that is extremely resistant to the chemical action of mineral and organic acids and other corrosive liquids which are present in varying'de- This invention relates to an alloy composed mainly of copper and silicon and containing sulficient and satisfactory machining properties.

' gree and While the addition of silicon up to 3% is desirable I have found that when this percentage is increased to 5% the alloy is brittle and does not possess the desired rolling characteristics. I

have

characteristics from the standpoint of the rolling mill, and

however to obtain all the desired characteristics by the addition of from to of one percent chromium .to this silicon copper alloy.

The alloy made in' accordance with my inven- Y tion may be described as having a base of copper to which appreciable amounts of chromium and silicon have been added for the specific purposes above noted, the silicon predominating the chromium. The alloy contains no other elements except purities, introduced with the chromium and sili- OOH.

Alloys containing from 2 to 3% of silicon with UNITED STATES PATEN ACID RESISTING ALLOY T OFFICE Reginald Hazeltine, Chicopee Falls, Mass. I

No Drawing. Application January 18, 1933 Serial No. 652,421

2 Claims. (Cl. -1)

chromium to give a high tensile strength to provide in all natural water supplies and that at possesses those physical properfoundry practice. exceptionally fine rolling characteristics.

found that the low percent silicon alloy or under) while possessing certain desired did not have the desired tensile strength good machining qualities. It is possible impure water.

I claim:

a small amount of iron and incidental imfrom to A. of one percent acterized physically by a hi 45,000 to 48,000 lbs. per sq. inch ultimate strength to 60,000 lbs. per sq. inch in a rolled strip, and possesses an elongation before fracture of from 53 to 58%. Also characteristics that permit the metal to be rolled into thin sheets orpressed and drawn into shapes of considerable depth.

These alloys may be produced by melting a... given weight of copper and adding to it pure refined silicon and an alloy of chromium copper or it may be made by alloying chromium and copper at a high temperature and adding pure refined silicon. It is advisable to protect the melting metal from oxidation by the addition of a small amount of charcoal as is done in ordinary in a cast bar, and 55,000

The above combination 0 chromium may be-regarded as a type of bronze and be designated as a silicon chromium bronze, and be handled in the foundry as any ordinary phosphor bronze of parts copper and 10 parts phosphor-tin. The ordinary deoxidizers such as phosphor copper or boron copper ma on the more common bronzes.

This 'alloy is characterized chemically by the extreme resistance to acids and corroding liquids that are the characteristics of the elements that make it up and is especially useful as a material for tanks, range boilers, pipes and other appa ratus often subjected to the corrosive action of 1. A copper base alloy containing 3 A of one percent chromium and the balance commercially pure copper.

2. A copper base alloy containing 1 to 5% silicon and to 1% chromium the balance "being commercially pure copper. I

REGINALD HAZELTINE.

chromium are chargh tensile strength,

f copper, silicon and y be used as silicon, 

